| 白鹤滩水电工程左岸玄武岩层间错动带渗透破坏预测与防治模拟 |
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| 引用本文： | 周志芳,沈琪,石安池,庄超,陈朦,李鸣威.白鹤滩水电工程左岸玄武岩层间错动带渗透破坏预测与防治模拟[J].工程地质学报(英文版),2020,28(2):211-220. |
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| 作者姓名： | 周志芳 沈琪 石安池 庄超 陈朦 李鸣威 |
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| 作者单位： | ①.河海大学地球科学与工程学院，南京 211100，中国 |
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| 基金项目： | 国家重大研究计划91747204 |
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| 摘 要： | 金沙江白鹤滩水电工程坝区发育有数条规模较大的、对工程有直接影响的玄武岩层间错动带。错动带内充填碎屑夹泥,当大坝建成蓄水之后,在高水头差下容易发生渗透破坏,可能影响坝区水工建筑物运行的安全和稳定。针对厂坝区的地形地貌、地质结构、大坝水工建筑物和防渗排水系统的设计布置特点,建立了坝区左岸三维有限元精细模型。并采用插值拟合的方法确定特定断面边界的地下水位,计算模拟了运行期白鹤滩电站左岸坝区渗流场的变化规律和水力梯度场的分布,并结合在现场开展的错动带的渗透破坏试验数据,确定了错动带的允许水力梯度,评价错动带内渗透破坏的可能性。研究结果表明:现有的渗控措施在坝区形成了明显的降落漏斗,地下厂区防渗排水系统效果良好,渗压得到了有效控制。然而C2错动带内部分区域的水力梯度超过允许水力梯度,可能会发生渗透破坏。提出设置截渗洞和加强帷幕的防治措施,并模拟验证了这一措施可以较好地截断渗漏通道,保障厂房安全稳定运行。
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| 关 键 词： | 白鹤滩水电站 层间错动带 渗流模拟 灌浆置换 截渗洞 |
| 收稿时间： | 2019-12-31 |
PREDICTION AND PREVENTION OF SEEPAGE FAILURE IN INTER-LAYER STAGGERED ZONE AT LEFT BANK OF BAIHETAN HYDRO-POWER STATION |
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| ZHOU Zhifang,SHEN Qi,SHI Anchi,ZHUANG Chao,CHEN Meng,LI Mingwei.PREDICTION AND PREVENTION OF SEEPAGE FAILURE IN INTER-LAYER STAGGERED ZONE AT LEFT BANK OF BAIHETAN HYDRO-POWER STATION[J].Journal of Engineering Geology,2020,28(2):211-220. |
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| Authors: | ZHOU Zhifang SHEN Qi SHI Anchi ZHUANG Chao CHEN Meng LI Mingwei |
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| Institution: | ①.School of Earth Science and Engineering, Hohai University, Nanjing 211100, China②.East China Institute of Survey and Design, Hangzhou 311122, China |
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| Abstract: | The interlayer staggered zones in the basalt are widely distributed in the Baihetan hydropower project area in Jinsha River Basin, China. They are filled with gravel, debris, and mud. The mud is easy to be destructed. After water impoundment, the seepage gradient in the interlayer staggered zones would increase with the effects of the high water head difference and seepage control measures. Seepage failure can happen in the zones. We establish a 3D finite element fine model of the left bank of the dam area. We use a method of interpolation from different sections to determine water distribution in mountain boundary without observation data. The results show that the existing seepage control measures have effectively control the seepage pressure. The hydraulic gradient in some areas of the interlayer shear weakness zones C2 is greater than the allowable gradient, and seepage failure can happen in these areas. The seepage-prevention hole and the reinforced curtain are effective preventions to decrease gradient, which can block reservoir water better. Moreover, the preventions can block the reservoir water to some extent when the curtain locally fails, which can ensure the seepage stability around the underground powerhouse. |
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| Keywords: | Baihetan hydropower station Interlayer staggered zone Seepage simulation Grouting replacement The impervious hole |
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